Re: [fetch] Observer API for fetch registry (#65)

I have an example of this usage pattern (a (node) client observing push_promises) in a server-to-server case- I stream IRC messages from one microservice to another.
https://github.com/rektide/tele-pump/blob/master/tele-muc-pump.js#L17

I also have tooling to notify the client of push_promises: I record all push_promises i send, then attach a X-Associated-Content header listing these pushed resources to responses to real requests. The client has to run a monkeypatched XHR, which is responsible for stripping out this header and postMessaging to the window a notice of this new content.
https://github.com/rektide/pushchannel

Would love a legit observer api, such that the first project could work without this out-of-band signaling invented in the second project.

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